If 36 men can do a piece of work in 25 hours, in how many

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If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

Here ,M₁ = 36 Men , T₁ = 25 hours , W₁ = 1
M₂ = 15 Men , T₂ = ? , W₂ = 1
We know that ,

⇒	M₁T₁	=	M₂T₂
	W₁		W₂

⇒	36 x 25	=	15 x T₂
	1		1

⇒ T₂ = 12 x 5 = 60 hours.